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Svetllana [295]
3 years ago
13

Which unit of measurement should be used for the vertical axis? A. millimeters B. centimeters C. kilometers D. decimeters

Chemistry
1 answer:
Veseljchak [2.6K]3 years ago
4 0

Answer:

Hmmmm...

Well, the only option that actually makes sense to me is

C. <em>Kilometers (km)</em>

<em></em>

<em>Please tell me if i'm wrong, but i feel really good about this one. Also, if i can help at all, just ask lol</em>

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Hello, everyone!
marusya05 [52]

Answer: 27.09 ppm and 0.003 %.

First, <u>for air pollutants, ppm refers to parts of steam or gas per million parts of contaminated air, which can be expressed as cm³ / m³. </u>Therefore, we must find the volume of CO that represents 35 mg of this gas at a temperature of -30 ° C and a pressure of 0.92 atm.

Note: we consider 35 mg since this is the acceptable hourly average concentration of CO per cubic meter m³ of contaminated air established in the "National Ambient Air Quality Objectives". The volume of these 35 mg of gas will change according to the atmospheric conditions in which they are.

So, according to the <em>law of ideal gases,</em>  

PV = nRT

where P, V, n and T are the pressure, volume, moles and temperature of the gas in question while R is the constant gas (0.082057 atm L / mol K)

The moles of CO will be,

n = 35 mg x \frac{1 g}{1000 mg} x \frac{1 mol}{28.01 g}

→ n = 0.00125 mol

We clear V from the equation and substitute P = 0.92 atm and

T = -30 ° C + 273.15 K = 243.15 K

V =  \frac{0.00125 mol x 0.082057 \frac{atm L}{mol K}  x 243 K}{0.92 atm}

→ V = 0.0271 L

As 1000 cm³ = 1 L then,

V = 0.0271 L x \frac{1000 cm^{3} }{1 L} = 27.09 cm³

<u>Then the acceptable concentration </u><u>c</u><u> of CO in ppm is,</u>

c = 27 cm³ / m³ = 27 ppm

<u>To express this concentration in percent by volume </u>we must consider that 1 000 000 cm³ = 1 m³ to convert 27.09 cm³ in m³ and multiply the result by 100%:

c = 27.09 \frac{cm^{3} }{m^{3} } x \frac{1 m^{3} }{1 000 000 cm^{3} } x 100%

c = 0.003 %

So, <u>the acceptable concentration of CO if the temperature is -30 °C and pressure is 0.92 atm in ppm and as a percent by volume is </u>27.09 ppm and 0.003 %.

5 0
3 years ago
What is the difference between an ionic bond and a covalent bond?
sweet-ann [11.9K]
Ionic bond - If a metal and non metal share a bond

Covalent bond - If two non metals share a bond

Comment if you need more help/information! 
5 0
4 years ago
What is the number of protons in a neutral atom with 31 electrons and 38 neutrons?
PSYCHO15rus [73]

31

I think. Protons and electrons share the same number as well as the atomic number.

5 0
2 years ago
Read 2 more answers
Write an equation that represents the action in water of rubidium hydroxide as an Arrhenius base.
Anika [276]

Answer:

RbOH  → Rb⁺ +  OH⁻

As the hydroxide can gives the OH⁻ in water, it is considered as an Arrhenius's base

Explanation:

Arrhenius theory states that a compound is considered a base, if the compound can generate OH⁻ ions in aqueous solution.

Our compound is the RbOH.

When it is put in water, i can dissociate like this:

RbOH  → Rb⁺ +  OH⁻

As the hydroxide can gives the OH⁻ in water, it is considered as an Arrhenius's base

3 0
3 years ago
  complete and balance the following reactions ?   uo2+ +cr o^2- 7 ـــــــــــــــــــــ uo2+ +cr3+
ivanzaharov [21]
In order to <span>complete and balance the following reactions, you should add a Fe into it. So it will look like  uo2+ +cr o^2- 7 ـــــــــــــــــــــ uo2+ +cr3+Fe. The answer to the following given statement or missing answer is Fe. </span>
3 0
4 years ago
Read 2 more answers
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